Dough mixer



pril 1924, 1,488,94

F.l L. Roxs DOUGH MIXER Filed Dec. 3, 1925 3 Sheets-Sheet 1 m E i924., 1943551194@ F. L. Hoxe DOUGH MIXER Filed Dec. 5, 1923 5 Sheets-Sheet 2 April l 1924. 1,488,941

F L.Roxs

DOUGH MIXER Filed Dec. 5, 1925 I5 Sheets-Sheet 5 S--S Figure 1.

Patented pr. 1, 1924.

STES

FRANK L. ROXS, OF CHICAGO, ILLINOIS.

DOUGH MIXER.

Application led December To ZZ u1/10m t muy concern Be it. known that l, FRANK L. Roxs, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have L'invented a certain new and useful Improvement in Dough Mixers, of which the following is a specification.

My invention relates to dough mixing machines andk the. general object of the invention is to provide an organized mechanism which shall be substantial in build, positive and smooth vin its action, and largely automatic.

Among thc specific. objects of the invention it is my purpose to provide means for automatically stopping the mixer carriage at the bottom of its descent and at the top of its rise.

Another object is to provide means for positively holding the tub in position while the mixing operation is taking lace.

Another object is to provit. e improved mechanism for supporting the carriage and `moving it up and down to bring the mixing arms out of and into the tub.

Another object is to provide means for relieving the carriage supports of the. weight and vibratory movement of the carriage during the mixing operation, I accomplish this by employing cushioning springs on which descends when the mixers are the carriage lowered into the tub. Thel springs also have incident to the a tendency to reduce the jar starting of the upward movement of the carriage. y

I accomplish iny objects by the mechanism illustrated in the accompanying drawings, in Which- Figure 1 is a front elevation otthe, inachine. Certain portions are broken awayy at the right side of the view for revealing some of the inner parts of the mechanism.

Figure 2 is an end elevation looking towardv the left in Figure 1. In this view certain of the parts are broken away at the right for the sake of clearness in showing some of the inner parts of the machine.

Figure 3 is a plan View taken on the line Figure 4 is a sectional view taken on the line lf-4 Figure 3.

Like numerals denote like parts throughout the several views.

According to the design shown. the machine is mounted upon a base plate 17 which 3, 1923. Serial No. 678,145.

supports the machine proper, and which also forms a platform onto which may be rolled the tub 2, which. contains the dough. Rising from the Vfour corners of the bed plate are posts 4 which are braced together at the upper end by beams 6. ,'End frames or panels 8 are located at each end of the machine, these being provided with vertical guideways 10. 'i'liese cooperate with gibs 12 mounted yupon the carriage 14 which supports all of the main operating parts of the machine.

lt, will be noted by refe-rence specially to Figures 2 and 3 that the machine is duplcii, that is, it is adapted to take two tubs at a time. For cach tub there are three mixer spindles 18 arranged verticallyand mounted so as to rotate in bearings Q0 mounted on the carriage. At the lower end the spindles are provided with arms or paddles 9.2 for mixing the dough. AJ:` the upper end the spindles are secured to bevel gears 9.4 by which they are rotated. These bevel gears mesh with pinions 26 fastened to horizontal shafts 28 journaled `in bearings 8O mounted `on the carriage. A power shaft 34 is also journaled in the carriage and driven by an electric motor 36. Said shaft. isprovided with a pinion -38 which meshes with a gear 40. A clutch l2 serves to connect and disconnect. the driving gearr 40 toand from a counter shaft Llshwhieh is journaled on the carriage. This clutch, which is best shown in Figure 3, is controlled by means of a. clutch lever 46 shown in elevation in Figure 1. the mixer shafts 28 by means of belts 48 and the other of said mixer shafts by means of pinions 50 and gears 52. y

The mixer shafts 28 not. only drive the mixer spindles but also serve to raise and lower the carriage. The mechanism for citer-ting this` will now be described.

The corner posts 4. previously mentioned, have threaded portions 5l. These are stationary and noiii' itatalile and forni screws The countershaft 44 drives one of which cooperate with rotatable sleeves 56 usual with bevel gear clutches. These bevel gears 76, 78 are permanently inV mesh with the bevel gears 72. .As theimixer shaft is powerdriven it ywill be evident that b y shifting the clutch sleeve into mesh with one or the other of the bevel gears 76, 78 the i bevel gears 72.vvill be rotated in one direction or the other and hence rotate the sleeves 56 in one direction or the other, depending' upon the position ofthe clutch sleeves. Thev mixer shafts 28 are caused to rotate in unison by belts 79 and pulleys 81, as shown in shifting i rod 82.

plan 1n Figure 3.

-The position `of the clutch sleeves is controlled by' forks `80 fastened to Aa clutch a lever 86 which has a stationary fulcrum 88 between its ends and a roller 90 at its lower end.. A stationary cam 92 is located in position to engage the roller 90 as the carriage descends and thus throw the lever 86 to such position that` the clutch sleeves 74 will occupy neutral position. This.4 will `prevent the rotationof the mixer shafts 28 from being transmitted to the sleeves 56.

Consequently the downward movement ot the carriage will be automaticallyY arrested. This occurs when the mixing arms 22 are in acting position within the tubs.

The clutch sleeve 74-is shifted to neutral position alsol by a stationary cam 94 shown at the upper `right corner of Fig. 1. This cam is located in positin to engage the arm 'fastenedgto the shifting rod 82. The resultis that when the carriage rises to proper elevation to lift the mixin arms out of the tubs the clutch sleeve will e shifted to neutral position and thus discontinue the rotation of the sleeve 56 and terminate the upwardmovement of; the carriage.

Projecting downward from the carria e are four elements which may bev regar ed 'as dowel pins. These in descending pass through apertures 102 formed in brackets 104 secured to the sides of the tub as shown in elevation in Fig. 1. Stationary sockets 106 areimounted on the base late 1 in position to receive the lower en s of the dowel pinsand brace them against llateral move ment. Thus when the carriage is lowered `theltubswill be securelyheld against move- Vnient upon the base'plate. Y. y

' Sometimes whenthg mixing arms `are in This rod is slidable in stationary bearings 84 and iscontrolled ,by

I have provided cushioning means; forv supporting the `carriage when 1t 1s down 1n acting `posltzon These cushioning Ameans include blocks 110 shown in end "elevation in Figure 2, and. in front elevation at the right end of F igure 1. These 'blocks `are guided by stationary upright pinv 112 and i seat upon helical compression springs `114'. whichfrest upon wings '116 of the` end pan els 8.` In ,order to prevent the;x guide pins carriage, `sockets 118 are formed in the under side of the overlying portions of the r carriage as shown in dotted linesin Figure 2. The parts are so constructed and 'proportioned that when the carriage is downin w operating position the weight vof it will be' vcarried partially or entirely bythe springs,

thus relieving the sleeves 56. It willbe i understood that when the mixing arms are rotating the tendency towardlviluation' exists to a considerable degree andthe wear 1 and tear on the yparts are greatly reduced by thus transferring the weight of .the car i. riage to the spring instead of having it carried by the rotatable sleeves 56.)'

Operation: Let it be assumed that' the carriage is in raised position and the clutch sleeve 74 in neutral position as villustrated in the drawings. that the `operator has thrown the main oon-T thus causing the dough that the tubs are in position for use. The

Letit be assumed alsoV .trolling lever 46 to'a position which will i cause the `motor to drive the jacl'r-.sha'ft'44,

mixing arm or'` paddle 72 to rotate. Let it-also be assumed, llm-'F operator throws the lever 86l 'toward the right of Figure 1, thus shifting' the clutch.l y sleeves 74 toward theleft and causingtheV sleeves 56 to rota-te in a direction which will lower thecarriage. The operator may then y.

leave the machine, for, as the 'carriagelappreaches the lower end of .its proper movement, the roller 90 at thelower end of the lever 86 'comes into contact with the cam 92 and is thrown by the latter toward the left. This restores the clutch 4sleeves 74 to neutral position and'termin-ates the rotation of the sleeves 56. Consequently the downward movement of the carriage ceases. The mixing armsare now in normal acting position and as they are rotating the machine may be left for such 'period as is Irequired -to complete the mixing action kon the dough.-

` As the `carriage Ldeeeends the dowel pins izol 85` from interfering with the descent of the '74,toivard the right Figure 1.

messer 100 engage the apertured brackets 162 and prevent thc tubs from changing their position. As previously intimated carriage as it approaches its lowermost position comes into contact with the cushioning blocks llO. Its downward movement is soon thereafter terminated but in thc meantime' the springs 114 will be. compressed to such extent as to carry part or all ot the eight ot' the carriage. This relieves the sleeves 56 and causes .the jar incident to the operation of the mixing arms to be absorbed.

As soon as the dough has been worked long enough the operator throws the lever 86 toward the left to throw the clutch sleeves This causes the sleeves 56 to be rotated in a direction to raise the carriage. As the carriage approaches the hi ghost proper position the arm 96 on the clutch rod 82 comes into engagement with the stationary cam 94.- which restores the clutch sleeves 74 again to neutral position. Thus it will be seen that the machine is largely automatic in its operation; also that it is rugged in construction, the

carriage being supported on tour sleeves which rotate simultaneously. It will also be evident that the tubs will be securely and au tematica-ily held. when the machine is in action, and that the jar of the dough mixers will be largely absorbed by the springs.

ln'addition to the cushioning effect for the sleeves 56 the springs 114 relieve the gearing which'controls the vertical position of the carriage. 'When the carriage is in lowermost position the springs, of course, are under compression and when the clutch is thrown to move the carriage upward the springs will help, start it upward with the result that the pressure will be thro-wn onto the gearing gradually. and thus the shock Vwill be eliminated or at least greatly reduced.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is: l. A douglrmixing machine having a dough container, rotatable mixing arms, a

' vertically traveling carriage Whereon said arms are mounted to be brought into and out of the dough, carriage operating means for raisingt and lowering the carriage, and means controlled by the movement of the' carriage for controllingsaid carriage operating means to thereby automatically terminate the vertical movement of the carriage.

2. A dough-mixing machinehaving a tub for the dough, rotatable mixing arms, a carriage traveling vertically and supporting said arms for moving theminto and out of the tub, carriage operating means including'a power device and a clutch for renderin'gthe power device operative and inoperative upon the remainder of the carriage operating.mechanism, a clutch shifter on the carriage for controlling the clutch, and stationary means operative upon the clutch shifter for throwing out the clutch to limit the tra 'el of the carriage. i

' 3. A mixing machine having a tub for the dough, rotatable mixing arms, a vertically traveling carriage for supporting said arms, means on the carriage for rotati ng, them, brackets on said tub and projections'frii/ounted on the carriage and adapted toengage said brackets when the carriage is lowered, whereby the tub will be held stationary while the mixing arms are acti-ng.

4. A mixing machine having a tub 'tor the dough, brackets extending therefrom, a vertically movable carriage, rotatable mixylng arms mounted upon the carriage in po sition to descend into the tub when the carriage is lowered, pins projecting downward from the carriage for engaging the bracket to hold the tub stationary during the mixing operation, and stationary sockets in positionto receive the lower end of the pins for bracing them while they are holding the tub.

5. A dough mixing machine having a tub, mixing arms, a carriage for moving the arms u and down out of'and into the tub, arm driving mechanism carried'by the carriago 'for rotating the arms, screw mechanism for raising and lowering the carriage, and a power device common tothe screw mechanism and the arm driving mechanism for operating both of them, said power device beiug mounted upon and movable with the carriage.

6. A dough mixing machine having a tub, mixing arms, a carriagev for moving the arms up and down out' of and into the tub, stationary upright screws, internally threaded sleeves cooperating with said screws, said sleeves supporting the carriage, and an electric motor mounted upon the carriage :tor rotating said sleeves in unison.

7. A dough mixing machine having a tub,

v mixing arms, a carriage for moving the arms up and down out of and into the tub, powermechanism on the carriage for rotat ing the arms, and cushioningy springs for supporting the carriage at the lowermost position oi' travel, for absorbing thel jar incident to the operation of the arms.

S, A. dough mixing machine having a tub, mixing arms, a carriage for moving the arms vertically into and out of the tub, a power device on the carriage for rotating said arms,.stationary upright screws, internally threaded sleeves working on said screws, the sleeves supporting the carriage and being rotated by said powerdevice, and cushioning springs for supporting the car riage at the lowermost point of its travel, for relieving the sleeves of part of the weight of the carriage While the arms are acting.

9. A dough mixing machine having a tub, a vertically movable carriage, dough mix isc ` 10 tub supporte ing arms rotatably mounted on said carringe, means for rotating said arms, means for moving the carriage vertically, and means carried by the. carriage and `vertically movable with relation to 1t for overlying and en aging different ortions of the tub ,when t c -carria e is in owermost position,

for preventin t e tub from rocking.

i A dou i n upon rollers, dough mixing arms, a carriage for supporting said. arms, means for rotating said arms, means supported by the carriage for movingr itV verti` cally, 'brackets on the tub, dowel pms on the carriage arranged vertically for` engaging `said brackets when the carriage is lowered, to prevent the tub from moving laterally durmg the mixing operation, and verticallyk adjustable collars mounted ron said dowel ecgpine and adapted to enga e scid brackets when the carriage is lowere for preventing the tub from rocking upon its rollers during the mixing operation. t A

y 11. A. dough-mixing machine havingfe tube, rotatable mixing arms, a carriage 'for moving the arms up and down out ofv and into the tub, screw mechanism for raising 21nd lowering the carriage, a power device,

iixing machine having a the carriave traveling with it and connecif 40 I ed to saic arms for rotating them, screw mechanism for raising and lowering the carria-ge, o clutch for connect-ing and disconneeting the screw mechanism to and from the power device, and clutch controllin '45 mhlllm part 0f which is stationary an part of `which is mounted npon the carriage and travels' with it in position to engage the stationary part, .to be operated thereby i for throwing out the clutch and thereby aut'to'metically terminating the Vmovement of the carriage.

In witness whereof, I have hereunto subscribed my name. l

FRANKL. noxs. 

